Question
Express the following percentages as ratios : 0.64%
✓
Answer
$\begin{aligned} \text { Ratio } & =0.64 \%=\frac{0.64}{100}=\frac{64}{100 \times 100} \\ & =\frac{4 \times 4 \times 4}{25 \times 4 \times 25 \times 4}=\frac{4}{25 \times 25} \\ & =\frac{4}{625}=4: 625\end{aligned}$
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